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dc.contributorDepartment of Building Services Engineeringen_US
dc.creatorLam, Ka Kit-
dc.identifier.urihttps://theses.lib.polyu.edu.hk/handle/200/6931-
dc.languageEnglishen_US
dc.publisherHong Kong Polytechnic University-
dc.rightsAll rights reserveden_US
dc.titleEmergency ventilation in tilted vehicular tunnelen_US
dcterms.abstractThis study aims to study the emergency ventilation configuration of transverse ventilation in a tilted vehicular tunnel. From the statistics in Hong Kong, the probabilities of having vehicular tunnel fire is very low. However, the consequence of any fire incidents in tunnel can cause huge damage to property and loss of lives. There is no internationally agreed prescriptive code or design guide on fire and smoke ventilation. The performance based standards for the tunnel ventilation design are of a wide range of values. This dissertation addresses specifically the tunnel emergency ventilation design information. Smoke movement in horizontal (0°) and tilted cases (2.5°,5°,7.5°, 10° in slope) were studied. Experimental studies are performed by a 1:25 scaled-model which is 1.7 m long 0.3 m width and 0.225 m high. The hot gas temperature, smoke movement pattern, transverse ventilation velocity, smoke layer interface height and smoke extraction efficiency at 0° to 10° slope of the tunnel were analysed. The transverse ventilation with constant ventilation flow rate in the vertical shaft was introduced into the tunnel smoke control system. The best performance of the upstream vent is at slope = 10°. The hot gas extraction capability of the downstream vent becomes zero as the slope increased to 5°. Result shows that the transverse ventilation is more effective in tilted tunnel with steeper slope. Effective smoke control requires a complete fire safety management system. The results in this research provide a comprehensive tunnel emergency ventilation design reference for tunnel specialists.en_US
dcterms.extent110 leaves : col. ill. ; 30 cm.en_US
dcterms.isPartOfPolyU Electronic Thesesen_US
dcterms.issued2011en_US
dcterms.educationalLevelAll Masteren_US
dcterms.educationalLevelM.Eng.en_US
dcterms.LCSHTunnels -- Fires and fire prevention.en_US
dcterms.LCSHEmergency ventilation.en_US
dcterms.LCSHHong Kong Polytechnic University -- Dissertationsen_US
dcterms.accessRightsrestricted accessen_US

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Please use this identifier to cite or link to this item: https://theses.lib.polyu.edu.hk/handle/200/6931